I haven't tested this, but it sounds very believable that the antialiasing
compares only the *colors* of adjacent pixels and doesn't take into account
the fact that the background could be, in fact, colorless (ie. fully
transparent). It's very understandable that this has happened (after all,
the antialiasing code was made long before there was any alpha channel code
in POV-Ray).
  I agree that the antialiasing code could take into account the difference
in pixels caused not only by the colors but also by the alpha channel.

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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